How would I go about backporting this pack to 1.20.1

[hexed helm]

https://modrinth.com/datapack/more-banner-patterns/versions

changed the pack format, but obviously more needs to be done. this is my first foray into this world so it'd be appreciated if someone more experienced could give me a few pointers?

[solid forge]

you can't backport this below 1.20.5

https://minecraft.wiki/w/Banner_pattern_definition

1.20.5 24w10a Banner patterns can now be defined in data packs.

[solid forge]

this is simply not possible using datapacks for 1.20.1

[hexed helm]

Aw :(

I was looking through changes but managed to miss that i suppose